Oxazin dye.



l l i l r UNITED STATES PATENT. OFFICE.

WILHELM LOMMEL, 0E ELBERFELD, GERMANY, Assrenon T0 FARBENFABRIKEN VORM.rmnnn'. BAYER- a; 00., or ELBERFELD, GERZMANY, A CORPORATION or enn-MANY.

oxazm DYE.

-No Drawing.

in New Dye, of which the following is a specification.

acid, galli'c acid esters} gallaminic acid, gall- I have found that newdyestutts of the oxazin series dyeing on a mordant can be obtained bycondensing para-nitrosophenols withpyiogallol derivatives, especiallygallic anilid, pyrogallol sul onic acid, etc. The new products are afterbeing dried and pulverized brown to black powders soluble withditliculty inwater, soluble in dilute caustic soda .lye generally with aviolet to brown color, furnishing from red-brown to violet chromelakeson the fiber, which are distinguished by a gland fastuess towashing and to chlorin. The leuco chmpounds of the new dyes can beproduced by treating the dyes with reducing agents.

lnorder to illustratethe new process more fully the following-example isgiven, the parts being, by weight-17 parts of gallaminic acid areintroduced into 250 parts of sulfuric acid of (S()B;,,18 parts ofparanitrosoplieuol are added and then the temperature of the mixture isslowly increased to 70" C. \Vhen the reaction is complete the mixture ispoured on ice water and the dye filtered oll witlrsuction. It is a darkpowder which is soluble in dilute caustic soda lye with a violet color,soluble in concentrated sulfuric acid with a reddish-violet color; itfurnishes a chrome lake on the fiber which is red-violet fast to washingand to chlorin. ()ther para-uit'rosophenols, such as nitrosecresols maybe used. a

'The new products can be used as dyestuffs. or in the shape (it theirvaluable leucocolnpounds. The dye obtained as described in the examplec. y. is dissolved in the calculated quantity of NaUll and is thenreduced with hydrosullite. The resulting leuco compound can be used aspaste or powder. lt. is

soluble in eom'rentratcd sulfuric acid with-a yellowish-greeu color.

()u treating-the new compounds with sull'urous acid or its salts such asbisultites, sulfites, compoumli are obtained which are Specification ofLetters Patent. Pa tented Feb. 28, 1911. f Application filedSeptember-22, 1910. Serial No. 583,190 7 I probably modified leucocompounds and which are very suitable for printing-purposes. They differfrom the parent substances in so far as they are better fixed upon thefiber and produce shades which are generally browner than the originalshades. .If the products obtained by the actionof sulfurous acidsubstances are fur ther treated with acids, they are again moditied intheir properties and produce shades different from those produced -Withthe \mother substances and the su'lturous acid modifications. Ontreating c. y. the dye described in the example with a bisulfitesolutiona product is obtained which furnishes on. the fiber a chrome lake whichis a reddish-corinth,'

browner than the lake of the parent material. On heating the lattercompound with hydrochloric acid a new product results which furnishes achrome lake being a corinth which is bluer than that obtained from thebisulfite product.

I claim:

1. The herein described new dyestuffs of the gallo-cyaaiin seriesobtainable by reacting with para-nitrosophenols upon pyrogallolderivatives, which products are after being dried and pulverized brownto black powders soluble with ditliculty in water,

soluble in dilute caustic soda lye generally with a violet to browncolor; tarnish ng from brown to violet chrome lakes on fiber;

furnishing leuco compounds upon treatment a eue( compound upontreatmentwith reduring agents; and furnishing a modified compound upontreatment with a l)l:-t|lllt(3;

which furnishes a reddish-coriuth chrome lake browner than that.obtained from the parentmaterial, which modified compound yields a;compound producing a corinth chrome lake bluer thanihat ofthe'bis'ulfite witnesses. y

WILHELM LOMMEL m X. Y 5 compound upon treatment with an acid sub- -Wineses:

stantially as described.

. v CHAS. J. WRIGHT, I In testimony whereof I have hereunto set WALTERV'oNNEeUn hand in the presence of twosubscribing

